HTML5

HTML5 itself provides document structure and APIs

HTML5 aims to deliver content without relying on specific plugins

HTML5 Functions

Removes XML elements from the HTML 4.01 approach

Features that previously required extremely long JavaScript code to implement indirectly are now integrated as official elements (e.g., <video>), making implementation simple

Many client-side user interface features that could only be supported through external plugins like Flash and Silverlight can now be implemented using the browser's native capabilities

New structural elements include header, footer, aside, figure, section, article, and more

impossible

HTML5 Drag and Drop - No transparency?

As others have suggested, you will need some sort of mechanism that will: Hide the element that is being dragged. Make a clone of the element that is being dragged. Put the clone in place of the element that is being dragged. Listen to the drag event to position the clone element.

https://stackoverflow.com/questions/9712535/html5-drag-and-drop-no-transparency

웹표준(Web Standards) | 웹접근성과 웹표준

https://seulbinim.github.io/WSA/standards.html#%EC%9B%B9%ED%91%9C%EC%A4%80-%EA%B4%80%EB%A0%A8-%EA%B8%B0%EC%88%A0%EC%9D%98-%EC%86%8C%EA%B0%9C

HTML5

HTML5 itself provides document structure and APIs

impossible

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